Tractor-trailer tank



FIG. 1 is the right side elevation view of a tractor-trailer tank incorporating my new design.

FIG. 2 is a top plan view thereof.

FIG. 3 is a left side elevation view thereof.

FIG. 4 is a rear end elevation view thereof.

FIG. 5 is a front end elevation view thereof. 

The ornamental design for a tractor-trailer tank, as shown. 